Electron Beam Welding/Brazing of Al-Li Alloy 2195 and Ti-Alloy TC4 in Vacuum
-
摘要: 研究采用真空电子束实现对2195铝锂合金和TC4钛合金的有效连接。通过金相显微镜、扫描电镜、能量色散谱、X射线衍射等技术, 分析了焊接接头的微观组织及成分特征, 并通过拉伸试验对接头进行了力学性能表征。实验结果表明:铝锂合金2195和钛合金TC4能较好地实现连接, 接头未发现明显的气孔和裂纹。在连接界面处, 金属间化合物以棒状、锯齿状、和胞状等形态生长, 其主要成分为TiAl3。接头在连接较弱的焊缝中心起裂, 平均抗拉强度260 MPa。Abstract: Here, we experimentally addressed the welding/brazing of Al-Li alloy 2195 and Ti-alloy TC4 with an electron beam in vacuum. The impact of the welding/brazing conditions on the microstructures, phase-structures and mechanical properties of the joint was investigated with scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and mechanical probes. The preliminary results show that an electron beam is capable of welding/brazing Al-Li alloy 2195 and Ti-alloy TC4 without oxidation under the optimized conditions. For example, no obvious pores and cracks were observed in the compact joint, comprising a 5 μm thick transition layer, close to Ti-alloy, and TiAl3 dominated intermetallic compounds in the form of columnar, cellular and pyramid grains grown in transversal orientation to Al-Li alloy side. An average tensile strength of the joint was measured to be 260 MPa; and cleavage fracture might possibly occur in the fairly weak mid-join.
-
Keywords:
- Electron beam welding /
- Aluminum-lithium alloy /
- Titanium alloy /
- Dissimilar metals /
- Microstructure
-
-
[1] Möller F, Grden M, Thomy C, et al.Combined Laser Beam Welding and Brazing Process for Aluminium Titanium Hybrid Structures[J].Physics Procedia, 2011, 12 (A):215-223
[2] 吕世雄, 敬小军, 黄永宪, 等.Ti/Al异种合金电弧熔钎焊接头温度场与界面微观组织[J].焊接学报, 2012, 33 (7):13-16 [3] Jiang S, Li S.Formation Mechanism and Growth Law of Diffusion Solution Zone between Al/Ti Liquid/Solid Interface[J].Rare Metal Materials & Engineering, 2011, 40 (6):983-986
[4] Guo S, Zhou Q, Kong J, et al.Effect of Beam Offset on the Characteristics of Copper/304 Stainless Steel Electron Beam Welding[J].Vacuum, 2016, 128:205-212
[5] Alhazaa A, Khan T I, Haq I.Transient Liquid Phase (TLP) Bonding of Al7075 to Ti-6Al-4V Alloy[J].Materials Characterization, 2010, 61 (3):312-317
[6] Sohn W H, Bong H H, Hong S H.Microstructure and Bonding Mechanism of Al/Ti Bonded Joint Using Al-10Si-1Mg Filler Metal[J].Materials Science & Engineering, 2003, A355 (1-2):231-240
[7] 陈树海, 李俐群, 陈彦宾.光斑形式对Ti/Al异种合金激光熔钎焊特性的影响[J].焊接学报, 2008, 29 (6):52-55+118 [8] Gupta S P.Intermetallic Compounds in Diffusion Couples of Ti with an Al-Si Eutectic Alloy[J].Materials Characterization, 2002, 49 (4):321-330
[9] 张玉岐, 杨春利, 林三宝, 等.2195铝锂合金超声TIG焊的组织与性能分析[J].焊接学报, 2015, 36 (10):53-56
计量
- 文章访问数: 6
- HTML全文浏览量: 0
- PDF下载量: 6
下载:
